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2. Chemical control trials against downy mildew (Peronospora destructor [Berk.] Casp.) on onion bulbs;Boyadzhiev;Gradin. Loz. Nauka,1982
3. Experimental Designs;Cochran,1970
4. Statistical Tables for Biological, Agricultural and Medical Research;Fisher,1963
5. Report of British Columbia Department of Agriculture, 1948;Foster;Report of Plant Pathology Branch,1949